In this paper experimentally, the friction-stir welding of the polypropylene sheets with 40% glass fiber has been investigated. Comparison to other welding methods, the strength of the joint is the most important feature in this process. Many parameters such as tool geometry, rotational speed, linear velocity, and tilt angle are very important as input parameters in this type of welding. Theref...

In this study, the effect of tool pin length on friction stir lap welding 430 and 304 stainless steels has been investigated. The thermal history interface was measured by thermocouple. interfacial macro- micro-structures under different lengths were analyzed via optical microscope scanning electron microscope. Also, tensile shear tests carried out to evaluate strength joint. results show that ...

A solder fatigue model for the 63Sn/Pb solder alloy has been previously introduced which characterizes the creep fatigue phenomena of the solder by combining nonlinear finite element modelling with experimental thermal fatigue lives of various flip chip assemblies. The model correlates the amount of creep strain energy dissipated per thermal cycle with the characteristic Weibull life of the cri...

the aim of this paper is to show the importance of analytic hyperbolic geometry introduced in [9]. in [1], ungar and chen showed that the algebra of the group sl(2,c) naturally leads to the notion of gyrogroups and gyrovector spaces for dealing with the lorentz group and its underlying hyperbolic geometry. they defined the chen addition and then chen model of hyperbolic geometry. in this paper,...

This paper studies the geometry of perspective projection into multiple images and the matching constraints that this induces between the images. The combined projections produce a 3D subspace of the space of combined image coordinates called the joint image. This is a complete projective replica of the 3D world defined entirely in terms of image coordinates, up to an arbitrary choice of certai...

The use of structural adhesives in automotive industry is increasing steadily, as manufacturers become aware of the advantages that adhesives can offer, compared with the conventional techniques. However, not only the adhesive properties must be analyzed, the geometry must be taken into account as well 1 . It is theoretically and experimentally proved that, adhesive joints are more reliable tha...

INTRODUCTION: Load distribution and shock absorption are the primary functions of menisci in the knee joint [1]. Therefore, maintenance of intact menisci is important for prevention of osteoarthritis. Radial tears are common injury types in menisci [2, 3]. Partial meniscectomy is generally used for treatment of radial tears [4]. In this operation, a small part of the meniscal tissue is removed....